[PyQt] QtGui.QApplication() never returns
hpj at urpla.net
Sun Dec 27 18:26:08 GMT 2009
On Wednesday 23 December 2009, 15:52:59 Joe Turpin wrote:
> On Mon, Dec 14, 2009 at 10:14 AM, Joe Turpin <joe.turpin at gmail.com> wrote:
> > On Mon, Dec 14, 2009 at 9:15 AM, David Boddie <dboddie at trolltech.com>
> >> On Sat Dec 12 21:47:16 GMT 2009, Joe Turpin wrote:
> >>> I have a very basic python script file that looks like the following
> >>> (taken directly from an online tutorial):
> >>> #!/usr/bin/python
> >>> # simple.py
> >>> import sys
> >>> from PyQt4 import QtGui
> >>> app = QtGui.QApplication(sys.argv)
> >>> widget = QtGui.QWidget()
> >>> widget.resize(250, 150)
> >>> widget.setWindowTitle('simple')
> >>> widget.show()
> >>> sys.exit(app.exec_())
> >>> The script runs to completion when I execute it under my regular user
> >>> account, but hangs when I execute it as root.. Using pdb I inserted a
> >>> set_trace() and found that it never returns from the call to
> >>> QtGui.QApplication(). Any ideas why this might be happening?
> I've been busy with other things, as I'm sure you all are, and haven't
> had time to investigate the deadlock occurring for me when I run my
> simple PyQt4 app as root.
> David, did my last email to the list with gdb and strace output give
> any clues to where the problem lies? It looks like a deadlock, but is
> this a result of system configuration or a software bug? I'm assuming
> you are able to run this as root, right?
I am: openSUSE 11.1 (Linux 126.96.36.199/i586) with sip 4.9.3, PyQt 4.6.2, Qt
4.5.3 and Python 2.6.0.
Might SELinux or the like gets in the way?
What I find suspicious is the pthread_cond_wait call! A strace as root
doesn't show anything related (apart from
open("/lib/libpthread.so.0", O_RDONLY) = 3
) here, but neither appears libQtDBus nor libdbus-1 in my traces.
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